Observations inspect radio emission from two magnetars

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Utilizing the Australia Telescope Compact Array (ATCA) and the Atacama Massive Millimeter/submillimeter Array (ALMA), astronomers have performed a research of two magnetars often called PSR J1622−4950 and 1E 1547.0−5408. Outcomes of this investigation, printed February Four on arXiv.org, present necessary details about radio emission from these two sources.

Magnetars are neutron stars with extraordinarily (above 100 trillion G), greater than 1 quadrillion occasions stronger than the magnetic area of our planet. Decay of magnetic fields in magnetars powers the emission of high-energy electromagnetic radiation, as an illustration, within the type of X-rays or .

Up to now, solely 24 magnetars have been found and solely 5 of them showcase pulsed radio emission, together with PSR J1622−4950 and 1E 1547.0−5408. PSR J1622−4950 is the primary magnetar found in radio band, whereas 1E 1547.0−5408 was first detected in a supernova remnant (SNR) G327.24−0.13 and was confirmed later as a magnetar by X-ray and radio observations.

A group of astronomers led by Che-Yen Chu of the Nationwide Tsing Hua College in Hisnchu, Taiwan, determined to investigate radio spectra of those two magnetars in an effort to shed extra mild on the properties of their radio emission. The analyzed knowledge had been obtained by ATCA and ALMA in 2017.

“We investigated the radio spectra of two magnetars, PSR J1622−4950 and 1E 1547.0−5408, utilizing observations from the Australia Telescope Compact Array and the Atacama Massive Millimeter/submillimeter Array taken in 2017,” the researchers wrote within the paper.

The radio emission from PSR J1622−4950 was clearly detected from 5.5 to 45 GHz by ATCA. It showcases a steep spectrum with a spectral index of about −1.three within the vary of 5.5–45 GHz throughout its reactivating X-ray outburst that occurred in 2017. For this magnetar, a big enhancement within the radio flux density has been detected, when the brand new outcomes had been in contrast with earlier research.

ATCA observations of 1E 1547.0−5408 discovered flux densities of 6.2 mJy at 43 GHz, 6.three mJy at 45 GHz, 8.1 mJy at 93 GHz and 9.Zero mJy at 95 GHz. The spectrum is match with a power-law and the researchers discovered a constructive spectral index of roughly 0.4. The magnetar showcases an inverted spectrum from 43 to 95 GHz, what signifies a attainable spectral peak at excessive frequency (few hundred GHz). Furthermore, the long-term X-ray mild curve of this magnetar reveals that the absorbed X-ray flux has steadily decreased for the reason that 2009 outburst however the flux stage in 2017 remained a lot greater than the bottom flux stage in 2006.

Typically, the analysis discovered that each PSR J1622−4950 and 1E 1547.0−5408 might have totally different emission mechanisms at cm and sub-mm band, what leads to double peak spectra with peaks at a couple of GHz and some hundred GHz. The research additionally delivered necessary info that would enhance our understanding of emission from magnetars and magnetar-like radio pulsars.

“We additional obtained the X-ray and radio knowledge of radio magnetars and a magnetar-like pulsar from literature and located, for the primary time, that the rising time of is for much longer than that of X-ray in some instances of outburst,” the authors of the paper concluded.

X-ray and radio bursts detected from magnetar 1E 1547.0–5408

Extra info:
Excessive Frequency Radio Observations of Two Magnetars, PSR J1622−4950 and 1E 1547.0−5408, arXiv:2102.02466 [astro-ph.HE] arxiv.org/abs/2102.02466

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Observations examine radio emission from two magnetars (2021, February 10)
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